NBC’s The Voice coaches are feeling “Hella Good” as they prepare for the seventh season of the hit singing competition television show. The Voice took to Facebook to share a new trailer for the season (which starts Monday night), showing all four coaches, country superstar Blake Shelton, Adam Levine, and newcomers Pharrell Williams and Gwen Stefani, performing a No Doubt hit. Based on this video, the camaraderie is...